Use the taskset command to restrict the CPU of a process

It is often felt that the system resources are insufficient, and no more than three important services can be run on a single machine. However, every day we need to perform backup compression and other operations on the machine, and the network will be transmitted for a long time, this affects the insufficient system resources;

At this time, we can limit some less important tasks, such as copy, backup, and synchronization, to a single CPU or a core of a multi-core CPU, although this is not necessarily the most effective method, it can maximize the use of valid resources to reduce the CPU resources occupied by less important processes;

TasksetIt can help us complete the work, and the operation is very simple;

The tool is installed by default. The RPM package name is util-Linux.

The following example shows how to use a previously written script to consume CPU resources. The original script is a shell script that consumes CPU resources. The following example shows how to exhaust the resources of four CPUs on a 16-CPU machine:

Use the TOP command to see the effect of 4 CPUs running full:

Now you can use the taskset command to adjust the CPU used by these processes:

Taskset-CP 1 25718 taskset-CP 3 25720 taskset-CP 5 25722 taskset-CP 7 25724
 

In top, let's look at the effect:

Haha, the CPU usage has been provisioned. Similarly, we can make a process use only a few CPUs:

 
Taskset-CP 25718
 

For more details, see man taskset.